/Engine/Plugins/Runtime/XRBase/Source/XRBase/Public/HeadMountedDisplayFunctionLibrary.h
Resets orientation by setting roll and pitch to 0, assuming that current yaw is forward direction and assuming current position as a 'zero-point' (for positional tracking).
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Input|HeadMountedDisplay") static void ResetOrientationAndPosition ( float Yaw, [EOrientPositionSelector::Type](API\Runtime\HeadMountedDisplay\EOrientPositionSelector__Type) Options )